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comparison vdp.c @ 1032:679137a0e78e

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Fix bug in vflip implementation when in double resolution interlace mode
author Michael Pavone <pavone@retrodev.com>
date Sun, 15 May 2016 16:22:45 -0700
parents 4263dc9cf86d
children fa6fe03f218a
comparison
equal deleted inserted replaced
1031:219de1d64aa1 1032:679137a0e78e
824 } 824 }
825 825
826 void render_map(uint16_t col, uint8_t * tmp_buf, uint8_t offset, vdp_context * context) 826 void render_map(uint16_t col, uint8_t * tmp_buf, uint8_t offset, vdp_context * context)
827 { 827 {
828 uint16_t address; 828 uint16_t address;
829 uint8_t shift, add; 829 uint16_t vflip_base;
830 if (context->double_res) { 830 if (context->double_res) {
831 address = ((col & 0x3FF) << 6); 831 address = ((col & 0x3FF) << 6);
832 shift = 1; 832 vflip_base = 60;
833 add = context->framebuf != context->oddbuf ? 1 : 0;
834 } else { 833 } else {
835 address = ((col & 0x7FF) << 5); 834 address = ((col & 0x7FF) << 5);
836 shift = 0; 835 vflip_base = 28;
837 add = 0;
838 } 836 }
839 if (col & MAP_BIT_V_FLIP) { 837 if (col & MAP_BIT_V_FLIP) {
840 address += 28 - 4 * context->v_offset/*((context->v_offset << shift) + add)*/; 838 address += vflip_base - 4 * context->v_offset;
841 } else { 839 } else {
842 address += 4 * context->v_offset/*((context->v_offset << shift) + add)*/; 840 address += 4 * context->v_offset;
843 } 841 }
844 uint16_t pal_priority = (col >> 9) & 0x70; 842 uint16_t pal_priority = (col >> 9) & 0x70;
845 int32_t dir; 843 int32_t dir;
846 if (col & MAP_BIT_H_FLIP) { 844 if (col & MAP_BIT_H_FLIP) {
847 offset += 7; 845 offset += 7;